Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Precious and base metal mineralization within the lower stratigraphy of the Stillwater Complex: New targets defined and old targets revisited
Group Ten Metals is exploring for base and precious metals within the Stillwater
Complex, a 2.7 Ga layered mafic/ultramafic intrusion, host to the world-class Sibanye
platinum group element (PGE) mines. Group Ten controls approximately 25 kilometers
of strike length of prospective mafic and ultramafic rocks in the western portion
of the Complex. The property includes multiple target types and indi
Authors
Craig Bow, Mike Ostenson, Justin Modroo, Allen K. Andersen
Seismic monitoring & response for the Trans-Alaska Pipeline System
The 800-mile Trans Alaska Pipeline System (TAPS) passes through extremely remote regions, where there is a high potential for seismic activity. Alyeska Pipeline Service Company, the TAPS operator, has been on the forefront of seismic engineering and situational awareness, and continues to enhance its capabilities. TAPS has used earthquake monitoring since the pipeline was constructed in 1977 and r
Authors
S Strait, David J. Wald
Using mobile GIS applications to support mineral resource investigations in the Eglab region, Algeria
The Algerian Geological Survey Agency – U.S. Geological Survey (ASGA-USGS) mineral resource assessment project in the Eglab region, Algeria, comprises the eastern part of the Reguibat Shield bounded by the Tindouf, Reggane, and Taoudeni basins to the north, east, and south, respectively. The use of mobile GIS applications on handheld tablets facilitated team coordination and ease of transition fro
Authors
Michaela R. Johnson, Nadjib F. Belanteur, Cliff D. Taylor
Element cycling in the Middle-Late Triassic Shublik Formation: Mineralization vs. recycling of biolimiting nutrients in an unconventional resource play
The Triassic Shublik Formation in northern Alaska is one of the major source rocks in North America, having generated much of the petroleum in Prudhoe Bay and associated fields. The middle Shublik Formation, the focus of this study, is a highly phosphatic, organic-rich carbonate mudstone interval. Apatite cements can occur as phosphatic peloids, steinkerns, elongate or angular nodules, and shells
Authors
Katherine J. Whidden, Julie A. Dumoulin, James Macquaker, Justin E. Birdwell, Adam Boehlke, Katherine L. French
Implications of aggregating daily production data on estimates of ultimate recovery from horizontal hydraulically fractured Bakken oil wells
The level to which data are aggregated can impact analytical and predictive modeling results. In this short paper we discuss some of our findings regarding the impacts of data aggregation on estimating change points in the production profiles of horizontal hydraulically fractured Bakken oil wells. Change points occur when production transitions from one flow regime to another. Change point determi
Authors
T. C. Coburn, Emil D. Attanasi
Status and trends of pelagic prey fish in Lake Huron, 2018
Scientists from the U.S. Geological Survey’s Great Lakes Science Center conducted integrated acoustic and mid-water trawl surveys of Lake Huron annually from 2004-2018. The 2018 survey was conducted during September and included transects in Lake Huron’s main basin, Georgian Bay, and North Channel. Mean lake-wide pelagic fish density was 1532 fish/ha and mean pelagic fish biomass was 4151 g/ha in
Authors
Timothy P. O'Brien, Steve A. Farha, David Warner, Peter C. Esselman, Kristy Phillips, Steven Lenart, Chris Olds
Scale-specific metrics for adaptive generalization and geomorphic classification of stream features
The Richardson plot has been used to illustrate fractal dimension of naturally occurring landscape features that are sensitive to changes in scale or resolution, such as coastlines and river channels. The Richardson method estimates the length of a path by traversing (i.e., “walking”) the path with a specific stride length. Fractal dimension is determined as the slope of the Richardson plot, which
Authors
Larry Stanislawski, Barbara P. Buttenfield, Barry J. Kronenfeld, Ethan J. Shavers
Proposed multi-period response spectra and ground motion requirements of the 2020 Recommended Provisions and ASCE 7-22
This paper summarizes a comprehensive set of proposals to the Provisions Update Committee of the Building Seismic Safety Council that would incorporate multi-period response spectra (MPRS) in the 2020 edition of the NEHRP Recommended Seismic Provisions for New Buildings and Other Structures (2020 NEHRP Provisions) and related proposals to the ASCE 7-22 Seismic Subcommittee of the American Society
Authors
Charles A Kircher, Sanaz Rezaeian, Nicolas Luco
Stream corridor sources of suspended sediment and phosphorus from an agricultural tributary to the Great Lakes
Fine-grained sediment and phosphorous are major contaminants in the Great Lakes and their tributaries. Plum Creek, Wisconsin (92 km2), a tributary to the Lower Fox River, has a Total Maximum Daily Load
(TMDL) requiring reductions of suspended sediment and phosphorus loading by 70% and 77%, respectively. In 2016-18, an integrated sediment fingerprinting and stream corridor-based sediment budget s
Authors
Faith A. Fitzpatrick, James Blount, Leah Kammel, David L. Hoover, Allen C. Gellis, Barbara C. Scudder Eikenberry
Conceptual framework for assessing disturbance impacts on debris-flow initiation thresholds across hydroclimatic settings
The destructive and deadly nature of debris flows has motivated research into empirical rainfall thresholds to provide situational awareness, inform early warning systems, and reduce loss of life and property. Disturbances such as wildfire and land-cover change can influence the hydrological processes of infiltration and runoff generation; in steep terrain this typically lowers empirical threshold
Authors
Benjamin B. Mirus, Dennis M. Staley, Jason W. Kean, Joel B. Smith, Rick Wooten, Luke A. McGuire, Brian A. Ebel
A transect through Vermont's most famous volcano - Mount Ascutney
The Cretaceous Ascutney Mountain igneous complex affords a classic exposure of the White Mountain Igneous Suite. Often called Vermont’s most famous volcano, Mount Ascutney (elev. 3,144 feet, 958 m) stands as a prominent monadnock in the Connecticut River Valley. The mountain often serves as an inspirational landmark, as it does when viewed from locations throughout the valley including the Saint-
Authors
Gregory J. Walsh, Brooks P. Proctor, Karri R. Sicard, Peter M. Valley
Micrometer-scale characterization of solid mine waste aids in closure due diligence
Precious- and base-metal mining often occurs in deposits with high acid-generating potential, resulting in mine waste that contains metals in forms of varying bioavailability, and therefore toxicity. The solids that host these metals are often noncrystalline, nanometer to micrometer in size, or undetectable by readily available analytical techniques (e.g., X-ray diffraction). This analytical short
Authors
Bryn E. Kimball, Heather E. Jamieson, Robert R. Seal, Agatha Dobosz, Nadine M. Piatak